Are paramecium heterotrophic or autotrophic? Explain your answer.

Place these events in the correct order of occurrence in the muscle contraction: End plate potential triggers an action potentia

Sunny_sXe [5.5K]

Answer:

1. Acetylcholine binds to receptors on the motor end plate

2. Ligand-gated channels open leading to depolarization

3. End plate potential triggers an action potential

4. Transverse tubules convey action potentials into the interior of the muscle fiber

5. Calcium is released from the sarcoplasmic reticulum

6. Calcium ions bind to troponin, which then moves tropomyosin

Explanation:

Acetylcholine (ACh) is a signaling molecule (neurotransmitter) that binds to receptors on muscle cells. This binding triggers the opening of ligand-gated sodium channels, thereby ions enter into muscle cells, which causes the depolarization of the sarcolemma and thus promotes the release of Ca2+ ions from the sarcoplasmic reticulum. The myoneural junction, also known as the motor endplate, is the site of synaptic contact between a motor axon and a skeletal muscle fiber. The endplate potential is the voltage that produces the depolarization of muscle fibers when ACh molecules bind to their receptors in the cell membrane. This depolarization spreads in the sarcolemma through transverse tubules (T tubules) and thus generates an action potential. Finally, this action potential induces the release of Ca2+ in the sarcoplasmic reticulum, which activates troponin protein and induces muscle contraction.

4 0

3 years ago

Which is not a process involved in the formation of sedimentary rock? compaction deposition extrusion weathering

NemiM [27]

Extrusion <span>is not a process involved in the formation of sedimentary rock</span>

5 0

3 years ago

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Water’s poler properties allow it to dissolve a wide range of compounds and assist these molecules with moving into and out of c

Anika [276]

im a rebel. cant wait to get banned. dont worry mods this is an alt. lol

5 0

3 years ago

A homozygous tall (dominant) pea plant is crossed with a short (recessive) plant. The probability that an F1 plant will be tall

Cerrena [4.2K]

Okay so my guess would be 75% percent because the tall plant is the dominate so because the dominate plant is tall and the recessive plant is short then that should make the dominate part of the plant stronger, making it taller.

3 0

4 years ago

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How did

kifflom [539]

Answer:

A visit to the Galapagos Islands in 1835 helped Darwin formulate his ideas on natural selection. He found several species of finch adapted to different environmental niches. The finches also differed in beak shape, food source, and how food was captured.

8 0

3 years ago